body{
    margin: 0;
    padding: 0;
}
.main{
    width: 100vw;
    height: 100vh;
    position:fixed;
    background-repeat: no-repeat;
    -webkit-background-size: cover;
    background-position: center 0;
}
.select {
    position: absolute;
    left: 40%;
    top:50vh;
    margin: 0 -16vw;
    width: 55vw;
    text-align: center;
    text-align-last: center;
}
.select>div {
    text-align: center;
    display: inline-block;
    /*border: 1px solid white;*/
    /*background: #000;*/
    width: 18vw;
    height: 5vh;
}
select {
    width: 100%;
    /*border: 1px solid red;*/
    background: rgba(0,0,0,0.5);
    color: white;
    height: 5vh;
    text-align: center;
    /*text-align-last: center;*/
}
select option {
    background: rgba(0,0,0,0.3);
    text-align: center;
}



/* 设置滚动条的样式 */
::-webkit-scrollbar{
    width: 12px;
}
/*滚动槽*/
::-webkit-scrollbar-track{
    -webkit-box-shadow:inset 0 0 6px rgba(0,0,0,0.3) ;
    border-radius: 10px;
}
/* 滚动条滑块 */
::-webkit-scrollbar-thumb {
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.8);
    -webkit-box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.5);
}
::-webkit-scrollbar-thumb:window-inactive {
    background: rgba(255,255,255,0.8);
}